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Re: Deinocheirus (was Sauropodz r kewl WAS: silly conversation on 2012 US presidential race)

On Fri, April 20, 2012 5:41 pm, tyazbeck@comcast.net wrote:
> Psittacosaurus? Also, isn't there a heterodontosaur w/feather-like
> structures?

Yes, at least one Psittacosaurus has quill-like elements on its tail, and
the early Late Jurassic heterodontosaur Tianyulong has more typical
"protofeather" plumulose elements.

> ----- Original Message -----
> From: "Joe Gilvary" <dinosaur@gilvary.net>
> To: "DML List" <dinosaur@usc.edu>
> Sent: Friday, April 20, 2012 9:06:08 AM
> Subject: Re: Deinocheirus (was Sauropodz r kewl WAS: silly conversation on
> 2012 US presidential race)
> This brought a question to my mind. Is there any evidence of dinosaurs
> with quills (like porcupines)? Is it possible for feathers, or related
> structures, to serve a similar purpose? Could something like that help
> explain why feathers evolved?
>   Thanks,
>   Joe
> Ar 4/20/2012 8:52 AM, scríobh Robert Schenck:
>> On Fri, Apr 20, 2012 at 8:45 AM, Thomas R. Holtz, Jr.<tholtz@umd.edu>
>> wrote:
>>>> From: owner-DINOSAUR@usc.edu [mailto:owner-DINOSAUR@usc.edu]
>>>> On Behalf Of Robert Schenck
>>>> e know how feathered their hands were; if they have
>>>> feathers coming off the fingers that might've made using them
>>>> as defense less likely. But you have to think, any animal is
>>>> going to do whatever it can to defend itself.
>>> Two things:
>>> No, we do not know how feathered the hands of therizinosaurs or
>>> ornithomimosaurs were, although we have oviraptorosaurs.
>>> But why would being feathered make them less used in defense? Even
>>> volant birds can be pretty violent in clubbing each other or
>>> predators with wings, and those are animals that use those forelimbs to
>>> fly (unlike the dinosaurs in question here).
>> Ah yes, as a reader of Naish's Tetrapod Zoology I should've remembered
>> all the different birds that have spurs and clubs on their limbs. Not
>> to mention that Hoatzin chicks can grasp branchs with their clawed and
>> feathered hands.

Thomas R. Holtz, Jr.
Email: tholtz@umd.edu   Phone: 301-405-4084
Office: Centreville 1216
Senior Lecturer, Vertebrate Paleontology
Dept. of Geology, University of Maryland
Fax: 301-314-9661

Faculty Director, Science & Global Change Program, College Park Scholars
Fax: 301-314-9843

Mailing Address:        Thomas R. Holtz, Jr.
                        Department of Geology
                        Building 237, Room 1117
                        University of Maryland
                        College Park, MD 20742 USA